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Investment Securities Available for Sale - Stated Reset Periods of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available for sale | $ 1,290,015 | $ 1,413,081
Less than 6 months |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available for sale | 79,734 | 182,128
6 to 24 months |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available for sale | 15,516 | 24,726
More than 24 months |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available for sale | 1,194,765 | 1,206,227
Agency RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available for sale | 1,101,344 | 1,169,536
Agency RMBS | Less than 6 months |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available for sale | 10,170 | 26,876
Agency RMBS | 6 to 24 months |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available for sale | 15,516 | 24,726
Agency RMBS | More than 24 months |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available for sale | 1,075,658 | 1,117,934
Non-Agency RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available for sale | 54,057 | 102,125
Non-Agency RMBS | Less than 6 months |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available for sale | 7,526 | 84,461
Non-Agency RMBS | 6 to 24 months |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available for sale | 0 | 0
Non-Agency RMBS | More than 24 months |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available for sale | 46,531 | 17,664
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available for sale | 134,614 | 141,420
CMBS | Less than 6 months |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available for sale | 62,038 | 70,791
CMBS | 6 to 24 months |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available for sale | 0 | 0
CMBS | More than 24 months |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available for sale | $ 72,576 | $ 70,629

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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